Today's Message Index:
----------------------
1. 07:25 AM - Re: 9024 questions (jonlaury)
2. 07:41 AM - How hot does it get?? (jonlaury)
3. 08:13 AM - Re: How hot does it get?? ()
4. 08:54 AM - Potentiometer , 3 lugs (jonlaury)
5. 09:24 AM - Re: Re: 9024 questions (Robert L. Nuckolls, III)
6. 09:43 AM - Difficulties- (glen matejcek)
7. 10:26 AM - NPN & PNP pin ID (Mike Welch)
8. 10:45 AM - 2 Fat Wires on a single terminal post? (tsts4)
9. 10:50 AM - Re: NPN & PNP pin ID (David E. Nelson)
10. 11:44 AM - Re: NPN & PNP pin ID (Mike Welch)
11. 12:00 PM - Re: 2 Fat Wires on a single terminal post? ()
12. 12:21 PM - Re: 2 Fat Wires on a single terminal post? (tsts4)
13. 12:48 PM - Re: Re: 2 Fat Wires on a single terminal post? ()
14. 12:59 PM - Re: 2 Fat Wires on a single terminal post? (tsts4)
15. 01:06 PM - (Cleone Markwell)
16. 04:06 PM - Re: 2 Fat Wires on a single terminal post? (Allen Fulmer)
17. 04:26 PM - Re: NPN & PNP pin ID (Richard Tasker)
18. 04:33 PM - Re: 2 Fat Wires on a single terminal post? (tsts4)
19. 06:02 PM - Re: NPN & PNP pin ID (Mike Welch)
20. 06:36 PM - Re: Re: 2 Fat Wires on a single terminal post? (Robert L. Nuckolls, III)
21. 06:55 PM - Re: NPN & PNP pin ID (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: 9024 questions |
Bob,
Because of the immense value of this forum and the prodigious amount of things
that you do (AEC, AEL, consulting), it's easy to get the impression that you couldn't
possibly have time for anything else but aircraft related electrica, and
US :D
But as much as I'd like to get my hands on some 9024's, I have found a few other
things to attend to(upholstery, flap position sensors, wheel alignment, panel
wiring...etc, etc, etc) to fill up my time at the hangar
:)
I look forward to you having the time again to shepherd AEL, but in the mean time
I'm happily grazing on the grass in front of me and wish you and your family
the absolute best of medical outcomes.
John
Do Not Archive
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| Subject: | How hot does it get?? |
Now you can know!
http://www.hallcrest.com/subcatindust.cfm?cat_id=67&sublvl_id=5&subcat_id=6
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| Subject: | How hot does it get?? |
Jon,
Nice - I've used these on my engine so observers can monitor temps
during test runs. I'm am now having a bit of trouble reaching my head
out of the canopy to read them on the engine. From here on I'm sticking
to the thermo's. Now here's an idea, invent something like this that has
a wire to send the temp signal to a gauge on the panel. Best of both
worlds. Popular with the race car folks. Can also be found at
http://www.pegasusautoracing.com along with many other air-worthy parts.
Glenn E. Long
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
jonlaury
Sent: Tuesday, September 21, 2010 10:38 AM
Subject: AeroElectric-List: How hot does it get??
<jonlaury@impulse.net>
Now you can know!
http://www.hallcrest.com/subcatindust.cfm?cat_id=67&sublvl_id=5&subcat_i
d=6
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| Subject: | Potentiometer , 3 lugs |
There are 3 solder lugs on a sliding trim pot that I'm using to drive my AFS flap
position indicator. Pins 1 & 2, through my multi-meter, indicate a 0-5K ohm
range, so I assume those are the power and ground pins.
What does pin 3 do? That must drive the indicator right? How do I check it with
the m-m?
Thanks,
J
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| Subject: | Re: 9024 questions |
> :)
>I look forward to you having the time again to shepherd AEL, but in
>the mean time I'm happily grazing on the grass in front of me and
>wish you and your family the absolute best of medical outcomes.
Thanks to all for their concerns and best wishes. Actually,
since my consulting clientele are either comatose or
slipping fast, I may actually have more time to devote to
AEC manufacturing.
I must confess also that I've been spending a lot of time
writing a book on ideas and issues for another forum.
That activity will be launched on a dedicated website
in the not too distant future. I do not have enough content
gathered together to fuel the launch. I'll announce the
activation of our sister website probably within the next
couple months. There will be a companion list-server for
that activity as well. Individuals interested in this activity
can watch the front page of aeroelectric.com for the launch
announcement.
In the mean time, I've just about got all the AEC manufacturing
ops loaded into my van and I've got a two-hour drive to figure
out how and where I'm going to get it set up in M.L. My volume
and floor space suited to electronics is about 1/3rd of what
I had in Wichita!
On the other side of that coin, I have a really nice wood shop.
I've been fabricating cabinets and remodeling patches for a house
Dr. Dee has in Lindsborg where she teaches. Had a high-priority
distraction this morning . . . my 3-year old grandson is learning
how to do "grandpa's famous scrambled eggs."
Bob . . .
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Hi Bob-
Sorry to hear of the difficulties, and hope that it all works out well and
quickly.
Glen Matejcek
aerobubba@earthlink.net
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| Subject: | NPN & PNP pin ID |
Group=2C
I'm in the middle of building the circuit Bob N. designed for the IvoProp
current
limiter.
I've got most of the things soldered to my little board=2C and now I'm re
ady to start tying
everything together with the resistors. I've done some homework=2C and mad
e sure I
got the polarity squared away for my diodes=2C capacitor=2C and what-nots.
Here's the problem...the transistors!! I've looked up the NPN 2N3904 and
the PNP 2N3906
data sheets=2C and thought I had the 1=2C 2=2C 3-collector=2C base=2C emitt
er all figured out.
Then=2C just to make sure I was on the right track=2C I called up a diffe
rent 2N3904
data sheet.......and it was BACKWARDS from the first one I just looked at!!
!! Now I
don't know who's lies to believe!!
Can someone please be kind enough to steer me in the right direction for
the
CORRECT pin ID on the two resistors I listed.
Thanks=2C Mike Welch
Message 8
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| Subject: | 2 Fat Wires on a single terminal post? |
Hi,
What's the best way to mount 2 fat wires on a single terminal post on the battery
contactor? Do you just clock the lugs so they lay flat one on top of the other
or should a spacer (ie like a plain nut) be placed between the lugs in order
to physically separate the wires along the post? Or does it even matter?
Thanks!
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings
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| Subject: | Re: NPN & PNP pin ID |
Hi Mike,
A isometric picture is worth a 1001 words:
http://www.fairchildsemi.com/ds/2N/2N3904.pdf
Regards,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Tue, 21 Sep 2010, Mike Welch wrote:
> Group,
>
> I'm in the middle of building the circuit Bob N. designed for the IvoProp current
> limiter.
>
> I've got most of the things soldered to my little board, and now I'm ready
to start tying
> everything together with the resistors. I've done some homework, and made sure
I
> got the polarity squared away for my diodes, capacitor, and what-nots.
>
> Here's the problem...the transistors!! I've looked up the NPN 2N3904 and the
PNP 2N3906
> data sheets, and thought I had the 1, 2, 3-collector, base, emitter all figured
out.
>
> Then, just to make sure I was on the right track, I called up a different 2N3904
> data sheet.......and it was BACKWARDS from the first one I just looked at!!!!
Now I
> don't know who's lies to believe!!
>
> Can someone please be kind enough to steer me in the right direction for the
> CORRECT pin ID on the two resistors I listed.
>
> Thanks, Mike Welch
>
>
>
>
>
Message 10
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| Subject: | NPN & PNP pin ID |
> A isometric picture is worth a 1001 words:
> Regards=2C
> /\/elson
/Velson=2C
Thanks for the link=2C but it was one of the two I was already looking at
.
I think I found the fly in the ointment=2C though!! After studying the s
econd 2N3904
diagram from "ON Semiconductor"=2C I see they use a different pin number de
signation. AH HA!!
They call Fairchild's pin#1=2C their pin#3=2C etc=2C etc.
Must be trying to confuse the weak-minded....:-)
In any event=2C I think I got it whipped! Thanks=2C Dave.
Mike Welch
Message 11
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| Subject: | 2 Fat Wires on a single terminal post? |
Todd,
If it were me, and I wanted it to be functional, look good and be safe I
would find a terminal connector that would fit both wires. Crimp and
solder. That not moving. That setup will place less stress on the
terminal connector than having two ends doubled-up.
Glenn E. Long
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of tsts4
Sent: Tuesday, September 21, 2010 1:41 PM
Subject: AeroElectric-List: 2 Fat Wires on a single terminal post?
Hi,
What's the best way to mount 2 fat wires on a single terminal post on
the battery contactor? Do you just clock the lugs so they lay flat one
on top of the other or should a spacer (ie like a plain nut) be placed
between the lugs in order to physically separate the wires along the
post? Or does it even matter?
Thanks!
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings
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| Subject: | Re: 2 Fat Wires on a single terminal post? |
Hmmm. I could see doing that for say 18-20AWG size wires, but I'm talking about
a 2AWG and a 4AWG on the same post. Is doing that common for fat wires? I
could be mistaken, but I don't thinking combining them into a single lug is an
option.
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings, Fuse
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| Subject: | Re: 2 Fat Wires on a single terminal post? |
Todd,
If you mean do they make a connector to fit 2 such wires, that would be
a yes. Whether that suits your installation setup...
Glenn E. Long
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of tsts4
Sent: Tuesday, September 21, 2010 3:18 PM
Subject: AeroElectric-List: Re: 2 Fat Wires on a single terminal post?
Hmmm. I could see doing that for say 18-20AWG size wires, but I'm
talking about a 2AWG and a 4AWG on the same post. Is doing that common
for fat wires? I could be mistaken, but I don't thinking combining them
into a single lug is an option.
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings, Fuse
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| Subject: | Re: 2 Fat Wires on a single terminal post? |
Thanks Glenn. You happen to a have a source? None of the usual aviation sources
carry anything like that so I'm guessing Mouser, Digikey, or similar? Also
does the connector have any special nomenclature that would help in narrowing
the search?
Thanks again!
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings, Fuse
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Bob,
Hope you can work things worked out there and
so I will go ahead with my concerns abt the
AEC9024-30.
It will soon be getting cooler and I hope to fly
my Zenith Zodiac with the Wm. Wynne Corvair
engine before it gets cold.
Looking at Fig Z-9, I propose using this circuit but
the 9024 module isn't available. Looking at the
diagram I see that the diode across the contactor
coil is missing and I would assume that is in the
module. I can do that. Then I'm not sure what else
I need to do. I have tried some things on paper
but each time I find something that isn't working.
If you could suggest something for the missing
parts of the circuit I could proceed. I'm an old
Ham but not a design engineer.
Cleone24@mchsi.com
Message 16
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| Subject: | 2 Fat Wires on a single terminal post? |
AC 43.13-1B, chapter 11, page 11-76, has several sketches of lugs connected
to various bolts, studs, etc. Depictions of installation order of washers,
lock washers, lugs, etc. I didn't look for similar data on connections to
contactors but I'll bet the book has something to say about that.
Allen Fulmer
RV7 working on cowling
N808AF reserved
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of tsts4
Sent: Tuesday, September 21, 2010 12:41 PM
Subject: AeroElectric-List: 2 Fat Wires on a single terminal post?
Hi,
What's the best way to mount 2 fat wires on a single terminal post on the
battery contactor? Do you just clock the lugs so they lay flat one on top
of the other or should a spacer (ie like a plain nut) be placed between the
lugs in order to physically separate the wires along the post? Or does it
even matter?
Thanks!
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=313237#313237
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| Subject: | Re: NPN & PNP pin ID |
There are, in fact, versions with different pin-outs. Not just a
different pin numbering scheme, but BCE connected to different physical
pin locations. I got bit by this once upon a time.
The only way to know exactly what you have is to know who made the part
(specific part number) and look at their data sheet.
You can do basic checking with your ohmmeter to easily find the base,
but you would need a transistor tester to ID the E vs C. Some
multi-meters have this capability built-in.
Dick Tasker
Mike Welch wrote:
> > A isometric picture is worth a 1001 words:
>
> > Regards,
> > /\/elson
>
> /Velson,
>
> Thanks for the link, but it was one of the two I was already looking at.
>
> I think I found the fly in the ointment, though!! After studying
> the second 2N3904
> diagram from "ON Semiconductor", I see they use a different pin number
> designation. AH HA!!
> They call Fairchild's pin#1, their pin#3, etc, etc.
> Must be trying to confuse the weak-minded....:-)
>
> In any event, I think I got it whipped! Thanks, Dave.
>
> Mike Welch
>
>
> *
>
>
> *
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| Subject: | Re: 2 Fat Wires on a single terminal post? |
I re-read Chapter 11 before my original post and didn't come away with a definitive
answer (except the max limit for terminating wires at a given terminal is
4). I think clocking the lugs so they don't interfere with one another with
a terminal boot over the lug on top is probably the I'm going to go unless this
is a violation of acceptable practices.
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone, Wings, Fuse
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| Subject: | NPN & PNP pin ID |
> You can do basic checking with your ohmmeter to easily find the base=2C
> Dick Tasker
Dick=2C
You are right about checking each brand's data sheet=2C but I do think I'
ve got
them figured out properly=2C tho.
Just for kicks=2C I think I'll check them out with my multimeter. It doe
s have that
function.
Mike Welch
Message 20
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| Subject: | Re: 2 Fat Wires on a single terminal post? |
At 06:29 PM 9/21/2010, you wrote:
>
>I re-read Chapter 11 before my original post and didn't come away
>with a definitive answer (except the max limit for terminating wires
>at a given terminal is 4). I think clocking the lugs so they don't
>interfere with one another with a terminal boot over the lug on top
>is probably the I'm going to go unless this is a violation of
>acceptable practices.
Acceptable practices has more to do with mechanical
issues than anything else. First, can you stack all
the terminals on and STILL have full threads sticking
out the top of the nut? How stiff are your conductors?
22759-pry-bars or welding-wire-noodles? What style
contactors? Mil-spec 3/8? fine thread, indpendent
connection studs or Stancor-WH contactors with
5/16" coarse thread studs integral with the
contactor's stationary contacts?
Bob . . .
Message 21
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| Subject: | Re: NPN & PNP pin ID |
At 06:17 PM 9/21/2010, you wrote:
><retasker@optonline.net>
>
>There are, in fact, versions with different pin-outs. Not just a
>different pin numbering scheme, but BCE connected to different
>physical pin locations. I got bit by this once upon a time.
>
>The only way to know exactly what you have is to know who made the
>part (specific part number) and look at their data sheet.
>
>You can do basic checking with your ohmmeter to easily find the
>base, but you would need a transistor tester to ID the E vs C. Some
>multi-meters have this capability built-in.
Hmmmm . . . we used many thousands of 2N3904/06 devices
in products I designed 40 years ago and I don't
think I ever got a problem-flag raised by production
stating that a batch of devices wouldn't fit the board
layout.
If you look at the Fairchild package drawing at:
http://www.fairchildsemi.com/products/analog/pdf/to92_dim.pdf
you'll note that it gives 3 pinout configurations for
both bipolar devices like the 3904 and field effect
transistors. Note also that three different BiP-Fet
pairs are labeled TO-92, TO-94 and TO-96. If you
were dealing with some house-numbered device and
trying to sort out interchangeability with any another
device, yes, you might find some pin-out differences
between two otherwise identical looking devices. But the
2N series numbers are JEDEC (Joint Electronic Devices
Council) numbers. To build a REAL 2N3904 it had better
be in a TO-92 configuration package to pass muster
with folks who make a living at tracking such things.
If you have electro-whizzies in hand marked 2N3904
then it's a pretty good bet that the pinouts conform
with the bi-polar column of the TO-92 column in the
above data sheet. Looking at the flat side with
leads down they run left to right EBC
That's the way my drawer full of 3904/3906 devices
are configured too.
Bob . . .
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